Heating load calculation & layout plan DIN: Is a new calculation necessary?

Tell me, doesn't the planned finished floor actually play a role? Parquet has a worse thermal conductivity than tiles. What do they calculate with if nothing is specified? Only with screed? Is that why there is an overlap in most rooms?

That should be in the calculation after all

Ah FB (seems to be floor) = 0.35 W/m²(K). But it's only listed. Hmm.

Edit: The heating guy hinted that I'm crazy. So basically, such a precise calculation is overkill for a single-family house and wouldn't change the design or building services anyway. I've now asked if he would accept an external plan. Let's see...

What else is there to say .....

Yes. According to the engineering office, the floor makes a significant difference.

Who pays the craftsman (at least indirectly)? It's probably you. So hand over the note and say: please do it this way. If the installation spacing in the bathroom changes from 5cm to 8cm, that is very unpleasant. But it at least ensures that the bathroom is not the coldest room with "good" supply temperatures.

Your heating technician doesn't seem to be quite up to the technical standard. Our energy consultant pointed out very emphatically in the appendix for the builder that the heating load calculation must not be misleading.

I have the feeling that the KFW world and the heating engineers' world live in different filter bubbles.

I rather believe the heating engineer doesn’t want anyone interfering. He has been working with heat pumps for over 10 years and sees himself as the expert. And then some annoying layperson with half-knowledge comes along and tells him how to do it. His design and execution will be sufficient for 80% of people anyway. I just want the last 20% as well. Or at least 15%. He’s not used to that. Unfortunately, when the contract was signed with the general contractor, I wasn’t knowledgeable enough; otherwise, I would have had that written into the contract. So the calculation isn’t even required (I’m only building according to the Energy Saving Ordinance). I now hope that the external planning will be accepted. He says that the way I want the calculation done will cost several thousand euros... hehe.